I have a 300A celeron w/128k of on-die cashe and you hit the nail on the head. Chipset is really what I wanted to know about. It is the 440BX, as you said, and Intel said it would cashe up to 4GB. I thought this sounded way too high, because the chipset also determines the casheable area of the system. But, I have 64MB in the system now and it sounds like I can go up to the 256MB I want without any problems. Thanks for your help. If you have any more thoughts in this area I'd love to hear them. Later..JW